The original powder containers I've seen are made of metal and are for the most part - unadorned.
They resemble a 'big' fruit can - sometimes painted black - other times red - with the designation of the type on the side.
There's usually a paper label affixed - the type is also stencilled onto the can, and there's a screwtop.
You may want to dual-post your request on the 'BROW Forum', since those boys deal in the buffalo shoots.
Good Luck!
Vaya,
Scouts Out!